That is the best book that I ( have read )on that subject.
reason = because that event has already happend in past but its impact is still on present so it is past perfect..........
Answer:
I am almost 100% sure it's y+2
B. To convince the audience of a certain viewpoint.
The water ran down from her hair and clothes; it ran down into the toes of her shoes and out again at the heels. And yet she said that she was a real princess. ... Now they knew that she was a real princess because she had felt the pea right through the twenty mattresses and the twenty eider-down beds.
